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<li class="navelem"><a class="el" href="dir_885cc87fac2d91e269af0a5a959fa5f6.html">E:</a></li><li class="navelem"><a class="el" href="dir_1156a89e522bba50a2971fe896a0c15e.html">!代码工厂</a></li><li class="navelem"><a class="el" href="dir_64066445c3883bf8de1933e8bad1a394.html">3D引擎</a></li>  </ul>
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<div class="title">cHighTimer.h</div>  </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;</div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="preprocessor">#pragma once</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="preprocessor">#include &lt;stdio.h&gt;</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="preprocessor">#include &lt;windows.h&gt;</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="preprocessor">#include &lt;math.h&gt;</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="preprocessor">#include &lt;limits.h&gt;</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;</div>
<div class="line"><a name="l00009"></a><span class="lineno"><a class="code" href="classc_high_timer.html">    9</a></span>&#160;<span class="keyword">class </span><a class="code" href="classc_high_timer.html">cHighTimer</a></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;{</div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="keyword">public</span>:</div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;        <a class="code" href="classc_high_timer.html">cHighTimer</a>()</div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;        {</div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;                m_int64StartCounts = m_int64CurrentCounts =0;</div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;</div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;                m_FPS =0;</div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;</div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;                <span class="comment">// 得到高精度计时器频率</span></div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;                <span class="keywordflow">if</span>(QueryPerformanceFrequency((LARGE_INTEGER*)&amp;m_int64Frequency))</div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;                        ;</div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;                <span class="keywordflow">else</span></div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;                        MessageBox(NULL, <span class="stringliteral">&quot;CPU不支持高精度计时器&quot;</span>, <span class="stringliteral">&quot;!&quot;</span>, 0);</div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;        }</div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;</div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;        <span class="keywordtype">void</span> start_counter()</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;        {</div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;                init_point1();</div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;        }</div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;        <span class="comment">// 高精度计数值之差× 1秒/频率（一次多少秒） =用时; 两帧之间的用时.</span></div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;        <span class="comment">// 返回时间单位：毫秒  </span></div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;        <span class="comment">// 都是相对上次调用get_elapsed_time()的时间差</span></div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;        <span class="keywordtype">float</span> get_elapsed_time()</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;        {</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;                init_point2();</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;                <span class="keywordtype">float</span> temp = (</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;                        (float)(m_int64CurrentCounts - m_int64StartCounts) / m_int64Frequency)*1000.0f;</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;        </div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;                update_point();</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;                <span class="keywordflow">return</span> temp;</div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;        }</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;        <span class="comment">// 接受逝去的时间</span></div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;        <span class="keywordtype">float</span> get_fps(<span class="keywordtype">float</span> elapsed)</div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;        {</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;                <span class="keyword">static</span> DWORD FrameCounter =0;</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;                <span class="keyword">static</span> <span class="keywordtype">float</span> Second =0;</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;                </div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;                FrameCounter++; <span class="comment">//帧计数增加</span></div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;                Second +=elapsed; <span class="comment">//用时增加</span></div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;                <span class="keywordflow">if</span>( Second &gt; 1000.0f)</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;                {</div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;                        m_FPS =FrameCounter;<span class="comment">// 得到FPS</span></div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;                        FrameCounter =0;</div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;                        Second =0;</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;                }</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;                <span class="keywordflow">return</span> m_FPS;</div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;        }</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;        <span class="comment">// 在限制的时间内执行用户函数</span></div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;        <span class="comment">// ClampTime单位为毫秒</span></div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;        <span class="comment">// 比如：ClampTime为1000，则在开始的1秒内，会执行该操作</span></div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;        <span class="comment">// 1秒过后，函数将不再执行</span></div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;        <span class="keywordtype">void</span> clampTimeToGo(<span class="keywordtype">float</span> elapsed, <span class="keywordtype">float</span> ClampTime, <span class="keywordtype">void</span>(*fuc)())</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;        {</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;                <span class="keyword">static</span> <span class="keywordtype">float</span> Second =0;</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;                Second +=elapsed; <span class="comment">//用时增加</span></div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;                <span class="keywordflow">if</span>( Second &gt; ClampTime)</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;                {</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;                        fuc();</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;                        Second =0;</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;                }</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;        }</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;        </div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;        <span class="comment">// 将主循环控制在一定帧内</span></div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;        <span class="comment">// 比如：传进来33，则将循环控制在每秒中执行33次</span></div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;        <span class="keywordtype">void</span> controlFPS(<span class="keywordtype">float</span> elapsed, <span class="keywordtype">float</span> FPS)</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;        {</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;                <span class="keyword">static</span> <span class="keywordtype">float</span> Time =0;</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;<span class="comment">//1 分解形式</span></div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;<span class="comment">//              float FramePerSecond =1.0f/FPS -》一帧多少秒</span></div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;<span class="comment">//      float ToMillSecond =1000.0f* FramePerSecond; -》一帧多少毫秒</span></div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;<span class="comment">//1</span></div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;                <span class="keywordtype">float</span> ToMillSecond = 1000.0f/FPS; <span class="comment">//一帧多少毫秒</span></div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;                </div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;                <span class="keywordflow">while</span>(Time &lt; ToMillSecond)</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;                {</div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;                        ::Sleep(1);</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;                        Time +=elapsed;</div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;                }</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;                </div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;                Time =0;</div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;        }</div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;</div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;<span class="keyword">protected</span>:</div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;        <span class="keywordtype">void</span> init_point1()</div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;        {</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;                <span class="comment">//使用高精度计时器，得到第一个计数</span></div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;                QueryPerformanceCounter((LARGE_INTEGER*)&amp;m_int64StartCounts); </div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;        }</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;</div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;        <span class="keywordtype">void</span> init_point2()</div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;        {</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;                <span class="comment">// 得到第二个计数</span></div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;                QueryPerformanceCounter((LARGE_INTEGER*)&amp;m_int64CurrentCounts); </div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;        }</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;        <span class="comment">// 更新并交换数据</span></div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;        <span class="keywordtype">void</span> update_point()</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;        {</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;                m_int64StartCounts =m_int64CurrentCounts;</div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;        }</div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;<span class="keyword">private</span>:</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;        LONGLONG                        m_int64Frequency; <span class="comment">//频率</span></div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;        LONGLONG                        m_int64StartCounts;<span class="comment">// 开始计数值</span></div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;        LONGLONG                        m_int64CurrentCounts; <span class="comment">//当前计数值</span></div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;        DWORD           m_FPS;</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;};</div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;</div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;<span class="comment">float ToSecond = 1.0f/FPS; //转换成执行一次用多少秒</span></div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;<span class="comment">                while(</span></div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;<span class="comment">                (float)(m_int64CurrentCounts - m_int64StartCounts) / m_int64Frequency &lt; ToSecond)       </span></div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;<span class="comment">                {</span></div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;<span class="comment">                ::Sleep(1); // 释放时间片</span></div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;<span class="comment">                init_point2(); // 得到最新当前计数器值</span></div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;<span class="comment">                }</span></div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;<span class="comment">  */</span></div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;</div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;  </div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;  <span class="comment">// start_time;</span></div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;  <span class="comment">// ...</span></div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;  <span class="comment">// (GetTickCount - start_time)&lt;&lt;33</span></div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;        <span class="comment">// sleep(1);</span></div>
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